Simplify.

a) [[$ \displaystyle\frac {8x^2 - 4x} {4x} = $]]

b) [[$ \displaystyle\frac {15a^2 - 12a} {3a} = $]]

c) [[$ \displaystyle\frac {6ab + 18b} {3b} = $]]

Take a picture of your solution and return it to the submission folder.